guttin



July 21, 1925.

I H' GUTTIN ROUND BELTING, METHOD OF AND APPARATUS FOR MAKING SAME 2 Sheets-Sheet l Fil'e d March 30, 1921 July 21, 1925. 1,546,929

H. GUTTIN ROUND BELTING, METHOD OF AND APPARATUS FOR MAKING SAME Filed Ma h 30, 1921 2 Sheets-Sheet 2 Patented July 21, 1925.

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UNITED stares PATENT OFFICE.

.HENRY GUTTIN, OF NEWV YORK, N. Y.

BOUND BELTING, METHOD AND APPARATUS FOR MAKING SAME.

Application filed March 30, 1921. Serial No. 456,915.

To all whom it may concern:

Be it known that 1, Heater GUTTIN, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Round Belting, Methods of and Apparatus for Making Same; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to malre and use the same.

This invention relates to round belting having certain desirable characteristics, and to a method of and apparatus for manufacturing such belting in a commercially practicable manner.

Commercial round belting, which is widely employed in driving light mchinery, has been manufacturedheretofore from leather. The growing scarcity of leather available for such purposes has led to the utilization of inferior grades which do not produce satisfactory belting. Leather belting of good quality is expensive, and it is desirable therefore to provide in commercial quantities a belting having all of the desirable characteristics of leather belting. Such a belting must be uniform in cross-5 ction and resistant to deformation. It must also be strong, supple and tough, capable of effectively transmitting power and adapted to be readily connected by the devices commonly employed in making endless belts. v 7

It has been heretofore suggested that strips of fabric may be rolled transversely by hand and cemented to provideround belting. Belting can only be produced accordto this method in relatively short lengths owing to the difiiculty ofmanuallyj rolling long strips of fabric, and then only at great of the convolutions of fabric. It is incapable of transmitting power effectively and is subject to rapid deterioration. Such belting has never found its way to the marlret because it is altogether unreliable and unsatisfactory andv cannot be employed to any advantage by users of round belts.

The primary object of this invention is the successful production of round belting having the desired characteristics from tez; tile fabric.

A further object of the invention is the provision a method of and apparatus for economically forming such belting from a strip of textile fabric at a materially re duced cost, whereby it may successfully re" place leather belting and become available for many other uses to which it is readily adapta ble.

Further objects and advantages of the invention will be apparent as it is better understood by reference to the following specification and the accompanying drawing. in which Fig. 1 is a view in elevation of an apparatus for formingbelting.

Fig. 2 is a plan view of the same ap paratus.

3 is an enlarged detail in section illustrating the forming operation.

Fig. 4; is a detail in section of the forming coil.

Fin". Fi -ft.

Fig. 6 is a plan view of a strip of fabric employed in making belting.

Fig. 7 is a view in perspective of the 5 is a section on the line 55 of finished belting, and

Fig. 8 is an enlarged sectional view of the belting.

labor cost. Moreover, the fabric cannot be successfully rolled by hand, so that it can be compacted thereafter in dies, because the non-uniformity of the material fed to the dies precludes the proper functioning there-- of and the production of a uniform belting of the desired character. It is impossible, for example, 'to produce belting in the man ner described without an axial passage whicl'i permits flattening when the belt is used, unless a core is introduced in rolling the fabric. Manually rolled belting is neces sarily irregular in cross'section, loose in texture, and therefore subject to deformation and liable to stretching and separation Although the dilliculties presented by the attempt to produce a satisfactory round belting from textile fabric are numerous and baffling, it has been discovered as a result of constant study and experiment for an extended period, that a belting which is free from voids permitting deformation and which presents all of the other desirable characteristics of leather belting, may be successfully made. Moreover, the fabric may be progressively and automatically coiled, thus avoiding the manual rolling operat-ion with its excessive cost and the irregularities which characterize a manually rolled belting. Belting may be economically manufactured in accordance with the present invention and the product is there fore a highly desirable article of commerce. It is less expensive than and quite as satis factory as leather belting which it is thus adapted to replace.

The improved belting is made from a strip of textile fabric impregnated prior to coiling with a suitable cementing material of mineral, vegetable or animal origin. Balata or gutta percha are suitable ma terials of this character and produce a very desirable belting. The impregnating ma terial is applied to the fabric by methods well understood by those skilled in the art; fabric impregnated with such material being obtainable in the market. The superiority of the belting is more particularly due to the method of coiling it progressively as it is drawn through a special coiling die at a temperature which must be carefully regulated to secure the best results. This temperature depends primarily upon the weight of the fabric and the amount of impregnation, and should be such that the impregnating material is softened to the extent that the fabric will readily slip into the desired conformation. The heating must not, however, be carried to a point which causes the fabric to lose a certain degree of stiffness, otherwise it will jam in the coiling die. The desirable temperature is affected by numerous factors which make it impossible to fix any exact limits, but with the apparatus hereinafter described the desirable temperature at which any given fabric may be successfully treated is easily determined. After the ceiling operation, the loosely coiled fabric is drawn successively through one or more dies of diminishing cross-sectional area which compact the belting by causing the convolutions to slip upon each other until the belting is solid and entirely without voids. The drawing is effected by passing the belting between grooved wheels, preferably having gripping pins to prevent slippage, and it is important that the last compacting die should be closely adjacent the bite of the wheels. Otherwise the outer convolutions of the belting slip on the inner convolutions with resulting deformation.

The belting thus formed is loosely wound on spools and placed in an oven where it remains until it is thoroughly heated to a temperature of substantially 180-200 F., the temperature of the belting-being uniform throughout. It is then removed from the oven and drawn rapidly through one or more shaping and compacting dies which ensurea product of uniform cross-sectional area. The belting is then permitted to cool and is ready for use. It is solid with no axial space and with the several convolutions united by the impregnating material which forms a perfect bond. The product is sutlicicntly' flexible to permit utilizatirm for all purposes for which leather belting of corresponding dimensions is used. lit thoroughly coated on its exterior surface with the impregnating material which makes it waterproof and ensures a good friction surface. It has a high tensile strength, does not stretch materially, and the convolutions do not separate under severe usage.

Referring to the drawing, indicates a roll of impregnated fabric which may be mounted in a suitable support (3, to permit rotation as the fabric is witlnlrawn. As indicated in Fig. (i, the faln'ic may be a woven strip 7, impregnated with balata, gutta percha or other suitable material 9.

A frame 9, preferably constructed of iron pipe, is provided with a plurality of projeetions of circular cross-section. A longitudinal member 11 of the frame is heated by a plurality of burners l2 fed from a pipe 13 and a Suitable mixer 14, with a mixture of gas and air. The heat is transmitted by conduction to the projeetirms l (l, which are thus brought to the desired teniperature. The impregnated fabric is threaded about a number of the projections 10 depending on the degree of heat required, which may be readily controlled by regulating the gas burnand selecting the number of projeetions to be engaged by the fabric. The heating of the fabric may, of course, be accomplishedlby other means.

The end of the fabric is passed through a ceiling die 15 which, as indicated. is prefer ably a conical shell having a plurality of internal convolutions 16 so that the fabric is loosely coiled in passing therethrough. The coiled fabric enters successively one or more compacting dies 17 of diminishing internal diameter, the last of which is supported by a standard 19, and then passes into the bite of a pair of grooved wheels 19 and 20, the grooves in the peripheries of the wheels being so formed as to provide a space of substantially the diameter of the finished belting. Pins 21 are disposed in the bottoms of the grooves to ensure against slippage. The wheels '19 and are mounted on shafts 22 and 23 journaled in suitable bearings in a frame 24- and provided with gears 25 and 26 meshing with each other. The gear 26 may be driven from any suitable source of power, for example, through a pinion 27 on a shaft 28 which carries a pulley 29 and is connected by a belt or other driving means to a motor 30. The pinion 27 may be driven by hand through the medium of a suitable crank if desired.

The belting, as it leaves the wheels, is compacted but somewhat distorted by the pins in the periphery of the wheels, so that a further and final forming is desirable to insure a product having a circular cross-section. This is LCCOI'I'IPllSlICd by heating the belting in a suitable oven. (not shown) which may be provided with a thermostat to ensure a uniform temperature. After heating as previously described, the belting is drawn through one or more dies similar to the dies 17, and after cooling is ready for shipment.

The finished belting 31 consists of a plurality of convolutions 82 cemented together and coiled tightly with no axial space. The product is therefore solid and cannot be flattened or otherwise deformed by wear. No core is necessary and the diiliculties which result from the introduction of a core are therefore avoided.

Obviously, belting may be constructed in various sizes to meet different requirements of power transmission by increasing the width and thickness of the strip of fabric employed. The belting may be made in any length by providing strips of fabric of such length which are progressively coiled and compacted in the manner hereinbefore described. Belts of the required length may be cut from the finished product and the ends may be connected by hooks or otherequivalent connecting means. The product may also be used for other purposes such, for example, as bell cord.

Numerous variations may be introduced in the materials employed and in the details of the method and apparatus without departing from the invention or sacrificing any of the advantages of the invention.

1 claim:

1. A method of making round belting from a strip of textile fabric impregnated with a cementing material, which comprises progressively heating and solidly coiling the impregnated fabric about one of its edges while it is at an elevated temperature and. thereafter compacting the coiled fabric to a.- solid body.

2. A method of making round belting from a strip of textile fabric impregnated with a cementing material, which comprises progressively heating and solidly coiling the impregnated fabric about one of its edges while it is at an elevated temperature, and. thereafter subjecting the coiled fabric to a. succession of compacting operations to pro-- duce a solid body.

.3. A method of making round belting from a strip of textile fabric impregnated.

with a cementing material, which comprises:

progressively heating and solidly coiling theinipregnated fabric about one of its edges while it is at an elevated temperature, compacting the coiled fabric to a solid body, sub-- leeting the belting to a uniform elevated temperature, and finally shaping it to a uni" form cross-sectional area while in a heated condition.

4. A. method of making round belting from a strip of textile fabric impregnated with a cementing material, which comprises heating the fabric, progressively coiling the impregnated fabric about one of its edges while it is at an elevated temperature, compacting the coiled fabric to a solid body, in heating the belting and finally shaping it to a uniform cross-sectional area while in a heated condition.

5. A method of making round belting from a strip of textile fabric impregnated with cementing material, which comprises progressively heating and ceiling the impregnated fabric about one of its edges while it is at an elevated temperature, there after subjecting the coiled fabric to a succession of compacting operations to produce a solid body, ire-heating the belting and finally shaping it to a uniform cross-sectional area while in a heated condition.

6. In an apparatus for making round belting from a strip of fabric, the combination. of means for heating the strip including a plurality of heat-conducting arms about which the fabric is threaded, means for progressively coiling the strip, means for compacting the coiled strip and means for drawing the belting through the'coiling and compacting means.

7. In an apparatus for making round bel"- ing from a strip of fabric, the combination of means for heating the strip including a plurality of heat-conducting arms about which the fabric is threaded, means for progressively coiling the strip, means for compacting the coiled strip, and means disposed in close proximity to the compacting means and adapted to draw the belting therethrough.

8. In an apparatus for making round belting from a strip of fabric, the combination of means for heating the strip including a. plurality of heat-conducting arms about which the fabric is threaded, means for progressively coiling the strip, means for compacting the coiled strip, and means disposed in close proximity to the compacting means and adapted to draw the belting therethrough including a pair of grooved wheels having pins in the bottom of the grooves to grip the belting.

In testimon whereof I affix m si nature.

HENRY GUTTTN. 

